I built a press fit yoke.  I used car top pads to make a yoke that can be forced between the gunnels.  I saw another one that was solid and relied on being able to spread the gunnels enough to get it installed.
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I did not like the idea of their fabric yoke for the same reason you didn’t.  I did not know of any manufactured yoke that would clamp to those gunnels.  Some of the yoke pad combinations that were suggested to me were about 20% the weight of the canoe. 
My first yoke broke just as I was starting the south Cache Lake portage so I had to use the pads that came with the canoe.  By the time I finished the North Cache Lake portage both sholders and both hips were black and blue.

Just MacGyvering here, but why not try making your own yoke using some Schedule 40 pvc pipe?

Maybe some 1" to 1 1/2 " pipe with a thin notch get the same in both ends. A little trial and error would get the right wedge length.

You could clamp your yoke pads to that pipe.

Similar idea, except this guy, used a round aluminum pipe he flattened on each end and bolted in, NO portage pads, pipe rides on pack. With a light canoe that might be okay? If you went with aluminum pipe, you don't bolt in or wedge, you get some Clevis pins for a quick mount/detach option.

Few bucks and a little tinkering you'd have something special.

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Talk about perfect timing ....

I was on the Placid web site this morning checking out an order form so I could call them tomorrow and purchase a Rapidfire.

The portaging aspect never occurred to me. I just automatically assumed light weight equals no problems.

I am going to hold off on a purchase decision until I get more info about portaging the Rapidfire.

Thanks